Liquid crystal display device with a light blocking film formed on a surface of a substrate that surrounds a phase difference film and an orientation film also formed on the substrate surface between the substrate and the phase difference film

• US 7,864,275 B2
• Filed: 08/13/2008
• Issued: 01/04/2011
• Est. Priority Date: 08/17/2007
• Status: Expired due to Fees

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Tanno, Junji, Teramoto, Masahiro
• Primary Examiner(s): HEYMAN, JOHN S
• Application Number:
  US12/190,631
• Publication Number:
  US 20090046213A1
• Time in Patent Office: 874 Days
• Field of Search: 349/110, 349/111, 349/114, 349117-121, 349/155
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation

Abstract

In a liquid crystal display device into which a phase difference film is incorporated on the color filter substrate side, the phase difference film can be formed more easily than the prior art. A pair of substrates and a liquid crystal display panel having a liquid crystal sandwiched between the above described pair of substrates are provided in such a manner that the above described liquid crystal display panel has a number of subpixels, each subpixel in the above described number of subpixels has a transmission portion and a reflection portion, and a first substrate from among the above described pair of substrates has: a light blocking film which is formed at least in a border between the above described transmission portion and the above described reflection portion and at least has a portion which surrounds only the above described reflection portion; an orientation film for orienting the phase difference film formed on the above described light blocking film; a phase difference film formed inside the portion surrounded by the above described light blocking film on the above described orientation film; a color filter formed on the above described phase difference film; and a flattened film formed on the above described color filter.

Claims

1. A liquid crystal display device, comprising a pair of substrates and a liquid crystal display panel having a liquid crystal sandwiched between said pair of substrates, characterized in that

said liquid crystal display panel has a number of subpixels;

and

each subpixel in said number of subpixels has a transmission portion and a reflection portion;

wherein a first substrate from among said pair of substrates has sequentially formed on a surface thereof facing said liquid crystal;

a light blocking film which is formed on said surface of said first substrate at least in a border between said transmission portion and said reflection portion and at least has a portion which surrounds said reflection portion;

an orientation film for orienting a phase difference film formed at least on a surface of said light blocking film facing said liquid crystal;

said phase difference film being formed inside the portion surrounded by said light blocking film on a surface of said orientation film facing said liquid crystal;

a color filter formed at least on a surface of said phase difference film facing said liquid crystal; and

a flattened film formed on a surface of said color filter facing said liquid crystal.

2. The liquid crystal display device according to claim 1, characterized in that

a second substrate from among said pair of substrates has a pixel electrode and a facing electrode, and

another surface of said first substrate on a side opposite to said surface facing said liquid crystal is a display surface.

3. The liquid crystal display device according to claim 2, further comprising an interlayer insulating film formed in a layer above said facing electrode, characterized in that

said pixel electrode overlaps said facing electrode and is formed in a layer above said interlayer insulating film.

4. The liquid crystal display device according to claim 2, characterized in that the second substrate from among said pair of substrates has a reflection layer formed in said reflection portion.

5. The liquid crystal display device according to claim 4, characterized in that said facing electrode is formed on said reflection layer.

6. The liquid crystal display device according to claim 1, characterized in that said orientation film is formed only in the region where said phase difference film is formed.

7. The liquid crystal display device according to claim 1, characterized by having a step forming layer which is formed in the region where said phase difference film is formed on said flattened film.

8. The liquid crystal display device according to claim 7, characterized by having a spacer in columnar form formed on said step forming layer.

9. The liquid crystal display device according to claim 1, characterized in that said phase difference film is formed of a polymer liquid crystal material.

10. The liquid crystal display device according to claim 1, characterized in that said light blocking film is formed around one subpixel and in a border between said transmission portion and said reflection portion.

11. The liquid crystal display device according to claim 1, characterized in that said light blocking film is formed only around said reflection portion.

12. The liquid crystal display device according to claim 1, characterized in that when subpixels adjacent to each other are a first subpixel and a second subpixel, no light blocking film is formed in a border between a reflection portion in said first subpixel and a reflection portion in said second subpixel.